Optical device for suppressing noise of laser using graphene

Abstract

Embodiments relate to a noise suppressor for suppressing noise of an optical signal, including a core through which the optical signal travels, a clad that is wrapped around the core and configured to expose part of the core, and a graphene layer formed on the part of the core, and a digital optical signal generation system including the same.

What is claimed is: 
     
       1. An optical device for suppressing noise of a laser, comprising:
 a core through which the laser travels; 
 a clad that is wrapped around the core; and 
 a graphene layer that interacts with the laser which travels through the core and prevents the noise in the laser from passing through, 
 wherein a shape property or a material property of at least one of the core, the clad and the graphene layer is set to have a threshold energy level between 0.5 milliwatts (mW) and 1 mW, and the noise has an energy less than the threshold energy level. 
 
     
     
       2. The optical device according to  claim 1 , wherein the graphene layer is formed on a surface of a groove of the clad to expose part of the laser field radially centered at core. 
     
     
       3. The optical device according to  claim 1 , wherein the core includes a first core and a second core, the first core and the second core being spaced apart from each other,
 the clad includes a first clad and a second clad, and 
 the graphene layer is formed between the first core and the second core. 
 
     
     
       4. The optical device according to  claim 3 , further comprising:
 a cover wrapped around the clad and the graphene layer and applied to fix the graphene layer. 
 
     
     
       5. The optical device according to  claim 1 , wherein the graphene layer prevents the noise in the laser to pass through by absorbing the noise. 
     
     
       6. The optical device according to  claim 1 , wherein the graphene layer allows a laser spectral component having energy that is higher than the threshold energy level in the laser to pass through. 
     
     
       7. The optical device according to  claim 1 , wherein the shape property includes at least one of a diameter, a volume and a thickness of the core, and/or the clad. 
     
     
       8. The optical device according to  claim 1 , wherein the material property includes at least one of concentration, dispersion and crystallinity of the core, and/or the clad. 
     
     
       9. An optical fiber ring cavity with the optical device according to  claim 1  for generating a continuous wave laser, comprising:
 a polarization controller that controls polarization of a laser within the cavity and transmits the laser to the optical device; 
 an amplifier that amplifies the laser having passed through the optical device; and 
 a coupler that splits the amplified laser for a laser output. 
 
     
     
       10. A digital optical signal generation system with the optical device according to  claim 1 , comprising:
 a continuous wave laser cavity that generates a continuous wave laser; 
 an optical modulator that embeds digital signals onto the continuous wave laser; and 
 a pattern generator that transmits an electrical control signal to the optical modulator. 
 
     
     
       11. An optical fiber pulse laser for transmitting a pulse laser to the optical device according to  claim 1 .